/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package app.web;

import app.modelo.Libro;
import app.negocio.GestionLibreria;
import app.negocio.ItfzGestionLibreria;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Johann Pando
 */
public class ServletAutor extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        ItfzGestionLibreria itfzGestionLibreria = new GestionLibreria();
        try {
            if (request.getParameter("autor") != null) {
                List<Libro> libros = itfzGestionLibreria.cargaLibrosPorAutor(request.getParameter("autor"));
                //Solo queremos el título, pero traigo el libro entero por si 
                //*más adelante es necesario cargar más datos.
                if (libros != null) {
                    //Con el fin de refactorizar, cargamos una lista de String.
                    List<String> titulos = new ArrayList<>();
                    for (Libro libro : libros) {
                        titulos.add(libro.getTitulo());
                    }
                    out.print(Utils.cadenaSeparadaComa(titulos));
                }
            } else {
                //Si no se recupera parámetros en el servlet es porque estamos
                //Cargando a los autores.
                List<String> listaAutores = itfzGestionLibreria.cargarAutores();
                out.print(Utils.cadenaSeparadaComa(listaAutores));
            }
        } finally {
            out.close();

        }

    }   

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
